/**
 *    Copyright 2016-2017 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.dynamic.sql.select;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Stream;

import org.mybatis.dynamic.sql.SortSpecification;

public class OrderByModel {
    private List<SortSpecification> columns = new ArrayList<>();
    
    private OrderByModel(List<SortSpecification> columns) {
        this.columns.addAll(columns);
    }
    
    public <R> Stream<R> mapColumns(Function<SortSpecification, R> mapper) {
        return columns.stream().map(mapper);
    }
    
    public static OrderByModel of(SortSpecification...columns) {
        return new OrderByModel(Arrays.asList(columns));
    }
}
